Conductor for transmission lines



April 3o, 1935-. H M, HALL 1,999,502

CONDUCTOR FOR TRANSMISSION LINES Filed May 7, 1952 l length of theconductor.

' Patented Apr. 30, 1935 UNITED STATES PATENT OFFICE y K K CONDUCTORvF0;,9;:;:;'sDISSIN' LVINES l Henry M. Halli, Toronto, Ontario, Canada 4Claims.

l0 production of the conductor.

I attain my obiectby producing a stranded conductor having a crosssection at any point shaped as a'regular polygon and having itsperipheral contour varied at different pointsin the The varied contouris provided by helically laying a plurality of large wires .in theconductor strand in spaced relationship to' one anothercircumferentially of the conductor, and a plurality of relativelysmaller wires The said smaller wires vary in diameter and are graded insize to produce a contour substantially flush with the large wires.

The constructions are hereinafter more specifically described andillustrated in the accompanying drawing in which Fig. l is across-section of my conductor; Fig. 2 a side elevation thereof; and Fig.3 a cross sectionof a modified form of the conductor.

In the drawing like numerals of reference indicate the correspondingparts in the different ilgures. n

Heretofore it has been the general practice to u use stranded conductorsof circular cross-seco ductor and then at the other side which producesan alternating force on the conductor in a plane at right angles to thenow of wind. To overcome this vibration, which results in the conductorbreaking at its points of connection with the towers, I construct the`conductor so that the eddy currents will not be uniform throughout thelength ci' the span between towers and therefore these eddy currentswill counterbalance and thus dampen one another.

n I is a core which may be formed of one or more wires or rods butpreferably of a plurality of stranded steel wires having a high tensilestrength. On the core are stranded'one or more layers of conductingwires 2 in the usual manu nerto form a conductor which to this point maybe circular in cross-section and in accordance with standard practice.On the stranded wires 2 is stranded a layer of conducting wires 3including a plurality of large wires 3 which arev equally spaced apartcircumferentially of the conductor. The wires 3 also include a pluralityof wires 3b, 3, 3d and 3 of different diameters but all smaller indiameter than that of the wires 3*. These smaller wires are laid betweenadiacent large wires 3e and are graded in size so that the smallest wireor wires 3e are positioned sub-V stantially midway between adjacentlarge wires 3*, and the largest wires 3b of ther smaller wires arepositioned next to the large wires 3".

From this description it is obvious that the cross-sectional contour atany point throughout the length of the conductor has been changed from acircle (through the conducting wires 2) to a regular pblygonal shape(through the conducting wires 3). As the wires 3 are helically laid, thecross-section of the conductor will remain constant throughout thelength thereof but the peripheral contour will vary. This variation inthe peripheral contour not only presents different shown' in Fig. 1, astream-line effect its produced so that, at intervals determined by thelead, pitch or lay of the helically laid wires 3, a wind from "v anydirection will ilow around both sides ofthe conductor and join behindthe rear wire 3* without the formation of these eddies.

0f course, it is obvious that the layer of conducting wires 3 need notbe the outer layer 'of the conductor and that the contour formed by thislayer of wires ,would be maintained in a successive layer or layers ofwires of equal diameters provided the successive layer or layers followthe direction of rotation oi' the wires 3.

What I claim as my invention is:

l. A stranded conductor having a symmetrical.

convex polygonal cross-sectional contour, coinprising a circular core; aplurality of large wires helically' laid in spaced relationship to oneanother circumferentlally on the core; and a plurality of relativelysmaller wires of various diamete'rs laid side by side between the largewires,

the small wires being graded according to size so that the smallestwires are substantially midway between the large wires and beingprogressively varied in distance from a circumscribed circle touchingthe large wires.

2. A stranded conductor comprising a plurality of wires helcallystranded and graded according to size relative to one another so thatthe crosssectional contour of the conductor at any point throughout itslength will be a symmetrical convex polygon, the wires touching aninscribed circle and the largest of the graded wires touching acircumscribing circle concentric to the inscribed circle, the othergraded wires being spaced from the circumscribing circle and beingarranged so that the smallest wires lie substantially mid# way betweenthe largest wires.

3. A stranded conductor comprising a bundle of round wires, theperipheries of the outer wires touching a circumscribed circle; threelarge wires helicallyD stranded on the bundle, the said large wiresbeing substantially equi-distant from one another lcircumferentially ofthe conductor; and

a plurality of relatively smaller wires of various diameters' laid sideby side between the large wires, the small wires being graded accordingto size relative to one another and to the large wires so that thesmallest wires are substantially midway between the large wires and thesaid small wires being progressively varied in distance from acircumscribing circle touching the large wires.

4. A stranded conductor including a. layer of helically stranded wiresof various diameters progressively and symmetrically graded according tosize from large to small and from small to large so that the conductorwill have three high points substantially equi-distantly spaced apartaround its circumference at any point throughout its length, the saidhigh points being defined by the largest of the wires and being locatedsubstantially midway between the smallest of the wires.

HENRY M. HALL.

